Question

Positions on earth are defined by their longitude (how far east or west you are) and latitude (how far north or south you are). Both latitude and longitude are angles. A nautical mile is one minute of degree of longitude along the equator. (A nautical mile is a little more than a regular mile.) Traveling at x knots means traveling at x nautical miles per hour. Suppose you fly in a Lockheed SR-71 (the fastest jet ever built) along the equator at a speed of 1,800 knots (roughly the top speed of the SR-71). Ignoring issues of refueling and such, it takes you________________hours to fly once around the world. You leave after breakfast and are back in time for a late dinner. Some airplane!
Hint: Flying once around the equator you cover 360 degrees of longitude.

Answer 1

A nautical mile is one minute of longitude
remember a degree is made up of 60 minutes

in other words 60 minutes per degree.
You have to go 360 degrees. How many minutes is that ?
and remember that will also be the number of nautical miles.

Can you figure out how many nautical miles around the earth?

if you can, then use rate * time = distance
rate is 1,800 knots (i.e. 1800 nm/hour)
and distance is the distance around the earth (in nm)
solve for time (in hours)

Answer 2

it's 12! thank you much :)